hatter/grassmudhorse.rs
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ref read_number

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This commit is contained in:
Hatter Jiang
2020-05-06 00:23:55 +08:00
parent 3518d91946
commit 42826cc78f
1 changed files with 20 additions and 23 deletions
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43
src/main.rs
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@@ -40,7 +40,7 @@ fn match_instruction(ins_coll: &InsColl, cs: &mut dyn Iterator<Item=char>) -> Re
match &ins.ins_type {
InsType::Path(ins_coll) => return match_instruction(&ins_coll, cs),
InsType::Node(ins) => {
let data = if ins.has_data() { Some(read_number(cs)) } else { None };
let data = if ins.has_data() { Some(read_number(cs)?) } else { None };
println!("{:?} {}", ins, if let Some(n) = data { n.to_string() } else { "".to_owned() }); // TODO
return Ok(Some(ins.new_instruction(data)));
},
@@ -53,35 +53,32 @@ fn match_instruction(ins_coll: &InsColl, cs: &mut dyn Iterator<Item=char>) -> Re
Ok(None)
}
fn read_number(cs: &mut dyn Iterator<Item=char>) -> isize {
let mut is_positive = 1_isize;
if let Some(c) = cs.next() {
if c == '草' {
is_positive = 1;
} else if c == '泥' {
is_positive = -1;
} else {
// Syntax ERROR!
fn read_number(cs: &mut dyn Iterator<Item=char>) -> Result<isize, ParseError> {
let is_positive = if let Some(c) = cs.next() {
if c == '草' { 1 } else if c == '泥' { -1 } else {
return Err(ParseError::ErrorSyntax("ERROR!!!! syntax error!".into()));
}
} else {
// Syntax ERROR!
}
return Err(ParseError::ErrorSyntax("ERROR!!!! syntax error!".into()));
};
let mut num = 0_isize;
while let Some(c) = cs.next() {
if c == '马' {
break;
} else {
num <<= 1;
num += if c == '草' { 0 } else { 1 };
loop {
if let Some(c) = cs.next() {
if c == '马' {
break;
} else {
num <<= 1;
num += if c == '草' { 0 } else { 1 };
}
}
}
is_positive * num
Ok(is_positive * num)
}
#[test]
fn test_read_number() {
assert_eq!(read_number(&mut "草泥马".chars()), 1);
assert_eq!(read_number(&mut "草泥草草草草泥泥马".chars()), 67);
assert_eq!(read_number(&mut "草泥草泥泥马".chars()), 11);
assert_eq!(read_number(&mut "草泥草草草泥草泥马".chars()), 69);
assert_eq!(read_number(&mut "草泥马".chars()).unwrap(), 1);
assert_eq!(read_number(&mut "草泥草草草草泥泥马".chars()).unwrap(), 67);
assert_eq!(read_number(&mut "草泥草泥泥马".chars()).unwrap(), 11);
assert_eq!(read_number(&mut "草泥草草草泥草泥马".chars()).unwrap(), 69);
}